Is my computer's gpu upgradeable?

I have a premade hp and I want to upgrade its graphics card so I can run bf3 smoothly on higher detail. Here is my computer information: ------------------ System Information ------------------ Time of this report: 9/18/2012, 11:10:00 Machine name: ALEKS-HP Operating System: Windows 7 Home Premium 64-bit... show more I have a premade hp and I want to upgrade its graphics card so I can run bf3 smoothly on higher detail. Here is my computer information:

------------------
System Information
------------------
Time of this report: 9/18/2012, 11:10:00
Machine name: ALEKS-HP
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120503-2030)
Language: English (Regional Setting: English)
System Manufacturer: Hewlett-Packard
System Model: p7-1010a
BIOS: Ver: CHI_714.ROM vCHI7.14
Processor: Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz (8 CPUs), ~3.4GHz
Memory: 16384MB RAM
Available OS Memory: 16366MB RAM
Page File: 4931MB used, 27799MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 32bit Unicode

I have a premade hp and I want to upgrade its graphics card so I can run bf3 smoothly on higher detail. Here is my computer information:

------------------
System Information
------------------
Time of this report: 9/18/2012, 11:10:00
Machine name: ALEKS-HP
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120503-2030)
Language: English (Regional Setting: English)
System Manufacturer: Hewlett-Packard
System Model: p7-1010a
BIOS: Ver: CHI_714.ROM vCHI7.14
Processor: Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz (8 CPUs), ~3.4GHz
Memory: 16384MB RAM
Available OS Memory: 16366MB RAM
Page File: 4931MB used, 27799MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 32bit Unicode

I was also told to submit this information:
1. My power supply has 230 volts (sticker where the power chord goes in)
2. I don't want to open my computer since I never have and I don't really have experience with this sort of thing but there's an air vent near the place where the graphics card goes and from there I can tell there's an empty space which looks to be above my current graphics card which I think could fit another one.
3. My budget is around $500

Thanks to "bloody hair" for helping me with these questions :)
Update: --------------- Display Devices --------------- Card name: NVIDIA GeForce GT 545 Manufacturer: NVIDIA Chip type: GeForce GT 545 DAC type: Integrated RAMDAC Device Key: Enum\PCI\VEN_10DE&DEV_1243&SUBSYS_23151462&REV_A1 Display Memory: 2754 MB Dedicated... show more ---------------
Display Devices
---------------
Card name: NVIDIA GeForce GT 545
Manufacturer: NVIDIA
Chip type: GeForce GT 545
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_1243&SUBSYS_231514...
Display Memory: 2754 MB
Dedicated Memory: 3019 MB
Shared Memory: 3831 MB
Current Mode: 1920 x 1080 (32 bit) (60Hz)
Monitor Name: Generic PnP Monitor
Monitor Model: HP x2301
Monitor Id: HWP2973
Native Mode: 1920 x 1080(p) (60.000Hz)
Output Type: HDMI
Driver Name: nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll...
Driver File Version: 8.17.0012.9628 (English)
Driver Version: 8.17.12.9628
DDI Version: 11
Driver Model: WDDM 1.1
Driver Attributes: Final Retail
Driver Date/Size: 3/15/2012 03:59:00, 17662784 bytes
WHQL Logo'd: n/a
WHQL Date Stamp: n/a
Device Identifier: {D7B71E3E-5103-11CF-4E52-19031
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